Turtleturtle *** I answered, "Sir, you know." And he said, "These are they who have come out of the great tribulation; they have washed their robes and made them white in the blood of the Lamb.... who are the ones that come out of the tribulation. what is the proof that they are not physical persons that were actually IN the tribulation.****
Londo111 answered the first part of your question. As a former JW, I now no longer accept the WBTS 2520-607 as correct end time eschatology. End time eschatology should NOT be a condition for salvation as there have been many views by great Christians over the past 2000 years. Personally. Amillennialism/Partial Preterism is more credible to me.
Your second question is based on Revelation 7, which is a recurring theme in chaper 14. The big picture is that out of a LIMITED number ( 144k ) selected from 12 tribes of Israel we then get a GREAT CROWD from ALL tribes, nations and kingdoms.
The nation of Israel was to be a light to the Gentiles. They were to bring a global paradise to the world. All blessings were to come from them.
These symbolic 144k spiritual Israel were the first century Christian congregation that were martyred, tortured, thrown to the lions, burned as torches under Roman powers. they were scattered and fragmented. Christ promised, THAT generation would not pass away until the all things occurred for judgement on Israel, and his presence to capture his own to himself. Out of that great tribulation came blessings to the great crowd of all nations ....rev 14:6 6 Then I saw another angel flying in midair, and he had the eternal gospel to proclaim to those who live on the earth—to every nation, tribe, language and people. 7 He said in a loud voice, “Fear God and give him glory, because the hour of his judgment has come. Worship him who made the heavens, the earth, the sea and the springs of water.”
I believe we are still living in this spiritual millinium of Christ, Right between Revelation 20:1-6, where we have a New order in the heavens and spiritual blessings here on earth, through the gift of living water from Christ and his kingdom. We only await for this millinium to end, with the final result of mortality been transfer to immortality. The ultimate New Heavens and New Earth and whatever resurrected bodies are suitable for that environment.
Shalom